American Institute of Certified Planners (AICP) Practice Exam

At which level of service do vehicles encounter delays during peak hours due to congestion?

1. Level of Service A

2. Level of Service B

3. Level of Service F

4. Level of Service E

The correct answer is: Level of Service F

Level of Service F is characterized by significant delays and congestion, particularly during peak hours. This level indicates a situation where traffic demand exceeds roadway capacity, leading to a breakdown in traffic flow. Vehicles are often unable to move effectively, resulting in high levels of congestion and extended travel times. In contrast, Levels of Service A and B represent conditions of free-flowing traffic, with minimal delays, where vehicles can move relatively unimpeded. Level of Service E reflects a situation where the road is near capacity, and while there may be occasional delays, it does not reach the severe congestion level seen in Level of Service F. Thus, Level of Service F is the correct choice for describing scenarios where vehicles face significant delays during peak hours due to congestion.